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Polypropylene foam and its preparation method

A technology of polypropylene and foam, applied in the field of online polypropylene foam, which can solve the problems of low market competitiveness and high manufacturing cost

Active Publication Date: 2020-06-12
LEE CHANG YUNG CHEM IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the manufacturing costs associated with HMS-PP are still relatively high, making HMS-PP foams less competitive in the market than polystyrene foams

Method used

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  • Polypropylene foam and its preparation method
  • Polypropylene foam and its preparation method
  • Polypropylene foam and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0104] Analytical method

[0105] Foam density

[0106] Measure the mass density ρ of the foamed polypropylene (PP foam) sample according to ASTM D792 f , Which involves weighing polymer foams in water using sinkers. ρ f The calculation is as follows:

[0107]

[0108] Among them, a is the apparent mass of the sample in the air, b is the apparent mass of the sample completely immersed in water, and ρ water Is the density of water.

[0109] Scanning Electron Microscopy (SEM)

[0110] The morphology of the obtained PP foam was detected by SEM (JEOL JSM-5600). The sample was immersed in liquid nitrogen for 30 minutes and then fractured, and the fractured surface was sprayed with a layer of gold for further observation by SEM.

[0111] Differential Scanning Calorimetry (DSC)

[0112] TA Q100DSC was used to detect the melting behavior of PP foam. A sample weighing about 6-10 mg was used for DSC detection, and the range of 30°C to 190°C was scanned at a rate of 10°C / min.

[0113] material...

Embodiment 4

[0162] Example 4-Foam sheet

[0163] In order to prepare the foam sheet, after the temperature in the extruder reaches equilibrium, the polymer particles are loaded into the hopper of the first stage extruder, and then the CO is filled with the LEWA micro-pump 2 In the first extruder, the gas / polymer mixture is transferred to the second extruder. Before the polymer melt flows out to the ring mold, the temperature of the barrel is reduced to avoid pre-foaming, and then the ring polymer melt is cooled by a cooling cylinder and cut into sheets, after which, The sheet is pulled to a compressed cylinder assembly and collected on a reel. Adjust the temperature of the die, the gap, and the drawing speed of the sheet to control the thickness of the sheet and the expansion ratio. The foaming conditions are summarized in the table below:

[0164]

[0165]

[0166] Before testing, all test samples were conditioned for at least 24 hours at 23°C and 65% RH.

[0167]

[0168] The density, tensi...

Embodiment 5

[0170] The following two foam formulations were prepared, and their shear viscosity was measured by capillary rheometry (capillary rheometry) technique at 190°C.

[0171] Example 5 (PPCFoam-T50): ST925+0.1%(phr)NAB-82+0.05%(phr)NX8000+10%(wt%)EBA

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PUM

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Abstract

A linear polypropylene foam having, for example, low density and / or high expansion ratio, said linear polypropylene foam comprising at least one polypropylene, at least one alpha nucleating agent and at least one beta nucleating agent nuclear agent. The present invention also provides compositions and methods for making said linear polypropylene foam.

Description

Technical field [0001] The present invention relates to a linear polypropylene foam, a composition and a method for producing the linear polypropylene foam, the linear polypropylene foam having, for example, low density and / or high expansion ratio . Background technique [0002] Generally, polymer foams contain at least two phases: (1) a polymer matrix that provides structure and support, and (2) gaseous pores or bubbles (also called "cells"). Due to its gas phase, the polymer foam has low conductivity and good thermal insulation properties. Typical applications of polymer foams include drink foam cups, food containers or trays, packaging, isolation, automotive, sports, and medical applications. [0003] The method of preparing a polymer foam usually includes the following steps: introducing gas into a polymer-based formulation, allowing bubbles to be generated and stabilized, and then curing the polymer structure containing bubbles. Polystyrene (PS) foam is the earliest and mos...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/14C08K5/00C08K5/098C08K5/053C08K5/20C08J9/12
CPCC08J9/122C08K5/0083C08K5/098C08K5/20C08L23/12C08J2423/14C08L2203/14C08L2205/24C08L2205/242C08J2323/12C08J2323/14C08J2203/06C08L23/14C08J9/0028C08J9/0052C08J9/0066C08J9/0095C08L23/10C08J9/0023C08J9/0014C08K3/22C08K3/34C08J9/16B29C44/3446C08F2500/12C08J2201/03C08J2205/044
Inventor 林江祥
Owner LEE CHANG YUNG CHEM IND CORP